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Delta Virtual Airlines Water Cooler | Airline Operations | PSS 757 touchdown at -6 feet
DVA10553
First Officer, B737-800

Joined on February 16 2012

Atlanta, GA USA

20 legs, 53.3 hours
9 legs, 22.0 hours online
18 legs, 47.7 hours ACARS
 Posted onPost created on February 26 2012 19:44 ET by Lucas Makhviladze
Hello (Sorry I don't know in which part of forum I should post so I posted here)

My problem is that when ever I'm landing with PSS 757 my touchdown is at -6 feet instead of 0. Can you help me how to correct it? (I mean AGL Altitude on PFD panel)

Thanks
DVA7752
First Officer, B747-400
OLP

Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
Online Double Century Club
Toulouse Century Club
Quatercentenary Club

"Turbulence just makes you have to go worse..."
Parker, CO USA

411 legs, 942.0 hours
246 legs, 564.4 hours online
389 legs, 904.0 hours ACARS
17 legs, 27.3 hours event
 Posted onPost created on February 26 2012 20:15 ET by Greg Stark
press B to change the barometer setting.


DVA10553
First Officer, B737-800

Joined on February 16 2012

Atlanta, GA USA

20 legs, 53.3 hours
9 legs, 22.0 hours online
18 legs, 47.7 hours ACARS
 Posted onPost created on February 26 2012 20:34 ET by Lucas Makhviladze
Greg Stark wrote:

press B to change the barometer setting.


It doesn't help. B works for MSL only.
DVA10082
Captain, B777-200
OLP

Joined on August 17 2011
50 State Club
Event Half Century Club
Tin Dispatcher
DVA Ten-Year Anniversary
Globetrotter
Bi-Millennium Club
Three Million Mile Club
US Coastal Club
US Mountaineer Club
Everett Bi-Millennium Club
Online Twenty Century

"Set your compass to 'E' and get out of my airspace!"
Monroe, LA

2,446 legs, 8,159.5 hours
2,018 legs, 6,424.5 hours online
2,411 legs, 8,065.7 hours ACARS
104 legs, 243.6 hours event
366 legs dispatched, 255.4 hours
 Posted onPost created on February 26 2012 20:44 ET by Josh Burr
it's probably, that the reader is 6 feet off the ground, not right on the tire...


DVA10553
First Officer, B737-800

Joined on February 16 2012

Atlanta, GA USA

20 legs, 53.3 hours
9 legs, 22.0 hours online
18 legs, 47.7 hours ACARS
 Posted onPost created on February 26 2012 21:06 ET by Lucas Makhviladze
Josh Burr wrote:

it's probably, that the reader is 6 feet off the ground, not right on the tire...


Do you know how to fix it?
DVA10082
Captain, B777-200
OLP

Joined on August 17 2011
50 State Club
Event Half Century Club
Tin Dispatcher
DVA Ten-Year Anniversary
Globetrotter
Bi-Millennium Club
Three Million Mile Club
US Coastal Club
US Mountaineer Club
Everett Bi-Millennium Club
Online Twenty Century

"Set your compass to 'E' and get out of my airspace!"
Monroe, LA

2,446 legs, 8,159.5 hours
2,018 legs, 6,424.5 hours online
2,411 legs, 8,065.7 hours ACARS
104 legs, 243.6 hours event
366 legs dispatched, 255.4 hours
 Posted onPost created on February 26 2012 21:08 ET by Josh Burr
No fix, I think its just the way it is, even in real world aircraft....sorry


DVA9677
Captain, B737-800
OLP

Joined on April 11 2011
50 State Club
Online Double Century Club
Quincentenary Club

"American 1482, your APU is leaking baggage."
Kissimmee, FL USA

543 legs, 735.9 hours
247 legs, 299.2 hours online
538 legs, 725.6 hours ACARS
2 legs, 2.8 hours event
 Posted onPost created on February 26 2012 22:35 ET by John Anderson
Josh is right. If you were to open the door and fall out of the aircraft, you'd fall 6 feet.
PMDG's 737 is 4 feet


DVA5973
Captain, B757-200

Joined on May 25 2008
B757 100 Club
Million Mile Club
Everett Millennium Club
Flying Colonel
DVA Fifteen-Year Anniversary

Atlanta, GA

1,514 legs, 4,691.2 hours
1,459 legs, 4,569.9 hours ACARS
 Posted onPost created on February 27 2012 14:41 ET by Joe Coughlin
That's correct, it will always read -6. I was thinking that as well the other day when I was flying the 75.


DVA853
Senior Captain, B747-400
OLP
E-MAIL

Joined on September 26 2002
50 State Club
Tin Dispatcher
Globetrotter
Two Million Mile Club
DVA Twenty-Year Anniversary
US Coastal Club
Toulouse Millennium Club
Bi-Millennium Club
Online Twenty Century
Cascadia Club

Rincon, GA

2,207 legs, 6,359.7 hours
2,186 legs, 6,317.8 hours online
2,175 legs, 6,226.6 hours ACARS
2 legs, 10.0 hours event
376 legs dispatched, 185.3 hours
 Posted onPost created on February 27 2012 15:09 ET by Chris Hannigan
John Anderson wrote:

Josh is right. If you were to open the door and fall out of the aircraft, you'd fall 6 feet.


I'll admit... I chuckled... smile

Chris Hannigan

Senior Captain, B747-400
DVA1763
Senior Captain, B757-200

Joined on June 29 2004
Everett 250 Club
Online Six Century Club
Seven Century Club
DVA Twenty-Year Anniversary

Oklahoma City, OK

723 legs, 2,015.0 hours
645 legs, 1,824.0 hours online
585 legs, 1,608.7 hours ACARS
10 legs, 44.8 hours event
740 legs, 2,044.9 hours total
 Posted onPost created on February 27 2012 15:12 ET by Steve Pickle
This is because the radio altimeter is calibrated to show 0 in the flare phase of landing. At that pitch up attitude the radar will travel further to the ground than when the nose is level, thus the negative reading when the nose in on the ground. Does that make sense? I had a really hard time trying to explain this for some reason..haha


DVA9677
Captain, B737-800
OLP

Joined on April 11 2011
50 State Club
Online Double Century Club
Quincentenary Club

"American 1482, your APU is leaking baggage."
Kissimmee, FL USA

543 legs, 735.9 hours
247 legs, 299.2 hours online
538 legs, 725.6 hours ACARS
2 legs, 2.8 hours event
 Posted onPost created on February 27 2012 15:56 ET by John Anderson
Actually makes alot of sense, and I understand now that I was wrong.
(Was thinking about the Kings, the top number is what your altimeter will read when you hit the obstacle and the bottom number is how far you'll fall after hitting it.
[a trip down memory lane])


DVA2301
Captain, B777-200
COMM

Joined on April 25 2005
Everett Century Club
Double Century Club
DVA Ten-Year Anniversary

Baltimore, MD USA

264 legs, 820.6 hours
90 legs, 221.0 hours online
234 legs, 757.3 hours ACARS
 Posted onPost created on February 28 2012 14:40 ET by Andrew Logan
After playing with the PSS 75, I think it's a "simism". In the flare, the radar altimeter goes through 0 and wheel touchdown is at -6. If I had to venture a guess I would say it was probably a coding issue. Radar altimeters are supposed to be calibrated to the wheel height, so when they are 0, the wheels are on the ground. This isn't always the case since there are always things playing tricks on the radar altimeter.

Also as a frame of reference... the QW 757 shows a radar altimeter altitude of 1 when on the ground. I didn't get to look at the CS 757 since I don't have it.

EDIT: I also checked some pics I have from the ERJ, and it shows us at 0 when on the ground too.... So I'm sticking with the probably a coding error from PSS.

Andrew Logan

Captain, B777-200
DVA2301
Captain, B777-200
COMM

Joined on April 25 2005
Everett Century Club
Double Century Club
DVA Ten-Year Anniversary

Baltimore, MD USA

264 legs, 820.6 hours
90 legs, 221.0 hours online
234 legs, 757.3 hours ACARS
 Posted onPost created on February 28 2012 15:02 ET by Andrew Logan
Steve Pickle wrote:

This is because the radio altimeter is calibrated to show 0 in the flare phase of landing. At that pitch up attitude the radar will travel further to the ground than when the nose is level, thus the negative reading when the nose in on the ground. Does that make sense? I had a really hard time trying to explain this for some reason..haha


Steve, the reason this is incorrect, is that in your setup the Radar Altimeter would be on the nose of the aircraft. Since during the flare the nose is higher than when on the ground, you would then want it to read 0, and negative when on the ground.

However, we don't much care about the nose in the flare, the main concern is the tail (no one likes a tail strike). So, if the sensors were to be calibrated to show 0 in the flare attitude and mounted on the rear of the aircraft, you would show a positive number when on the ground. The Dash-8 did this. The Radar Altimeter on that plane was mounted on the tail. So during the flare we would get down to 0 and then when on the ground and level, the plane would show 5.

Andrew Logan

Captain, B777-200
DVA10526
First Officer, MD-11

Joined on February 07 2012

Várpalota, Veszprém HU

30 legs, 209.4 hours
25 legs, 184.7 hours online
27 legs, 183.6 hours ACARS
 Posted onPost created on February 28 2012 15:19 ET by Zsolt Horvath
By the way, is there any radar altimeter indicator in the CS 767?

Zsolt Horvath

First Officer, MD-11

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